Clerestory Roof Glazing Above the New Foyer

IQ Projects used the Invisio® system to create a significant example of clerestory structural roof glazing in Wales, measuring approximately 27.3m long and 2.6m wide. Installed between the original town hall and the roof of the new foyer extension, the clerestory glazing introduces daylight from above and helps preserve the visual distinction between the listed building and the contemporary addition.

The roof comprises 21 clear toughened double glazed panes, each measuring approximately 1.25m wide. Structural silicone sealed joints connect the individual units, creating a continuous glazed surface with minimal visual interruption. Glazed upstands align with the roof panes and extend along the full length of the installation, providing a consistent finish at the roof perimeter.

A three degree fall was incorporated into the structural glass roof to allow rainwater to run off effectively. This precise detailing was particularly important given the exposed roof location and the need to protect both the new foyer and the historic building fabric from future water ingress.

Glass Fins Supporting the Clerestory Roof Glazing

The structural roof glazing is supported by low iron laminated glass fins, maintaining transparency through the triple height foyer while providing the strength required for the overhead glass. These fins are fixed to the wall using stainless steel back plates and secured with stainless steel bolts, creating a robust support structure without introducing heavy opaque framing.

Low iron glass was selected for the supporting fins to improve clarity and reduce the green tint associated with standard clear glass. This allows the supporting structure to remain visually discreet and ensures that attention stays focused on the restored masonry and decorative facades of the original town hall.

Installing the glass roof required detailed planning and temporary works coordination. A mini crane was positioned on the roof to lift the glazing into place, with installation completed following an extended period of wet and windy weather. Close collaboration between IQ Projects, Knox & Wells and the wider project team enabled the large overhead glazing to be installed safely within the complex heritage redevelopment.

Technical Glazing Summary

IQ Projects provided the following structural glazing for Maesteg Town Hall:

• Invisio® clerestory glass roof measuring approximately 27.3m long by 2.6m wide and comprising 21 double glazed panes.
• Three degree roof fall with continuous glazed upstands for effective water run-off.
• Clear toughened double glazing with solar control, low E coatings, laminated interlayers and heat soak testing.
• Low iron laminated glass fins with stainless steel fixings supporting the roof glazing.
• Structural silicone joints creating a continuous glazed finish with minimal visual interruption.

Speak to IQ Projects About Structural Roof Glazing in Wales

Maesteg Town Hall demonstrates how structural roof glazing in Wales can connect historic and contemporary architecture while introducing daylight into a new public foyer. The combination of an Invisio® glass roof, glazed upstands and structural glass fins creates a transparent link that preserves views of the listed town hall and supports the building’s new cultural role.

Early engagement with IQ Projects can support the design and specification of structural roof glazing for heritage, cultural and leisure projects where large spans, water management, thermal performance and complex installation requirements need detailed technical coordination. Contact our team to discuss how bespoke architectural glazing can be integrated into your next project.